Unveiling facet-dependent degradation and facet engineering for stable perovskite solar cells.
basic_science · Level V
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- Record sourced from PubMed, PMID 36634188.
- Also identified by DOI 10.1126/science.adf3349.
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Abstract
A myriad of studies and strategies have already been devoted to improving the stability of perovskite films; however, the role of the different perovskite crystal facets in stability is still unknown. Here, we reveal the underlying mechanisms of facet-dependent degradation of formamidinium lead iodide (FAPbI<sub>3</sub>) films. We show that the (100) facet is substantially more vulnerable to moisture-induced degradation than the (111) facet. With combined experimental and theoretical studies, the degradation mechanisms are revealed; a strong water adhesion following an elongated lead-iodine (Pb-I) bond distance is observed, which leads to a δ-phase transition on the (100) facet. Through engineering, a higher surface fraction of the (111) facet can be achieved, and the (111)-dominated crystalline FAPbI<sub>3</sub> films show exceptional stability against moisture. Our findings elucidate unknown facet-dependent degradation mechanisms and kinetics.